Yes, you can still request a key even if you don’t meet the requirements.
You might not always meet the requirements for a Campaign, but that's okay!
Publishers will review each request on a case-by-case basis, so it is possible to get a key even if you don't hit the numbers and vice-versa.
By requesting a key, you will be placed on a waitlist that is visible to the owner of the Campaign, then it is up to the publishers and developers to decide whether or not your activity and channel are right for them!
As much as our support team would love to inform creators with precise ETAs for the wait times on keys, that is something only the publishers themselves have control and visibility of!