No, you cannot email them unless they actively request to receive emails from your organization again.  The opt-out request is permanent and does not expire. Note that due to spam traps (BB743742), leaving the records as opted out is in your best interest.

If the message recipient submits a request to opt out of receiving future message from a sender, all of the following apply:
  1. The opt out must become effective within 10 business days.  After this time, the sender (or anyone on its behalf) may not send further commercial e-mail messages falling within the scope of the opt-out request to that recipient, unless the recipient subsequently requests to receive (opts in) these messages.
  2. The opt out never expires.
  3. The sender (and any other person that knows the recipient has opted out of further commercial messages) cannot sell, exchange or otherwise transfer the recipient’s e-mail address except as required by law unless that recipient has explicitly opted in to permitting the sale, exchange or transfer. 
(15 U.S.C. § 7704(a)(3)-(5)(A)(i)-(iv).)