Not at the moment as the tokens are security sensitive, you may be able to check oout the db schema and see if you can find them in the database.
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Sorry to reply to such an old thread but I happened across this while on the community site. I thought I would add this in for your benefit and other clients who may see this question.
You can use the Admin SQL located at <your site>/blocks/reports/view.php?courseid=1&action=dashboard with the following SQL query:
SELECT u.firstname, u.lastname, s.name6 AS "Service Name", t.token FROM mdl_external_tokens t JOIN mdl_external_services s ON s.id6 = t.externalserviceid JOIN mdl_user u on t.userid=u.id
You could make your own modifications to the SQL such as a 'WHERE t.userid=<insert your userid>' at the very end. Otherwise you could use the drop down at the bottom of the page to export to a CSV and use a program like Excel to filter the results manually.
Hope this helps!