Hi Devin,
Thanks for reaching out to us,
Keys do get deleted if no use is detected within 90 days so if you are not using it it will automatically be removed in due time.
But if you are concern to delete it before that then please send us more information like:
-email us with that email id which you have registered the key with us,
-key's last few (4 to 5) digits to make sure correct key we delete
Let us know if we can help you more.
Thank you,
Open platform API team,
The Guardian.