The following process of running queries against the Symantec_CMDB database and then running a scheduled task will allow tokens to be deleted:

Step 1: 
--/ List tokens found in the Item table
SELECT i.[Guid],i.[Name] AS Token,i.[Description],c.[Type] FROM Item i
JOIN ItemClass ic ON ic.[Guid] = i.[Guid]
JOIN Class c ON c.[Guid] = ic.ClassGuid
WHERE c.[Guid] IN
(
'269133D6-EAB3-4656-AB55-8EBD97849813', --Altiris.TaskManagement.Tokens.SimpleToken
'0E60F498-3A46-45D2-A80A-181B44A06366', --Altiris.TaskManagement.Tokens.TokenTreeItem
'2B9D75DC-A754-4D97-A573-2FA963EE88DD', --Altiris.TaskManagement.Tokens.FormatToken
'A9A0100C-F15A-4F0D-A1C0-F8E7B34732A4' --Altiris.TaskManagement.UI.XmlCallback.TokenViewCallbackHandler
)

Step 2: 
--/ Target a Guid to be deleted by the "NS.Hidden Purging Maintenance.{16290a7d-3cee-451e-b4d8-96c5784f12ec}" schedule task
INSERT INTO ItemToDelete ([Guid]) VALUES ('Guid of token')

Step 3:
Either wait for the "NS.Hidden Purging Maintenance.{16290a7d-3cee-451e-b4d8-96c5784f12ec}" schedule task to run at 0230hrs the next morning (default setting), or run it manually after opening the Task Scheduler applet as Administrator.

--/ Confirmation of deletion
SELECT * FROM ItemToDelete --No results should be returned
SELECT * FROM ItemDeleted WHERE ItemGuid = 'Guid of token' --One row should be returned

The “Settings > Deployment > Tokens” page will no longer list this token.

WARNING:  ALWAYS BACKUP THE DATABASE BEFORE MODIFYING ANY OF ITS OBJECTS DIRECTLY VIA SQL