One of the reasons you may see a "token invalid" notice may be because the person who initially connected SongSelect to Presenter has been removed from CCLI's SongSelect users list.
To fix this issue, click on the gear icon in the top right corner of Presenter and select "Settings" from the drop-down menu. On the following page, open "Connections" under the Advanced header in the left-hand menu. Once there, simply disconnect SongSelect and then reconnect it with an active SongSelect login for your church. Doing so will re-establish the connection so that you can return to importing songs from SongSelect without issue.
For any SongSelect support, please contact CCLI.