In two situations you can apply EAD or interim EAD in the local USCIS office:
1. You EAD application in a service center has been pending for more than 90 days, then you can go to the local office and apply interim EAD. If you are lucky, you get in the same day.
2. You I-485 has been transfered to the local office, then you can apply EAD in the local office which is normally much faster than in the service center.
In any other cases, I'm afraid you have to wait for more than 90 days to receive EAD according to the current speed.