Mo. Rev. Stat. § 340.262
If a person is otherwise eligible to renew his or her license, the person may renew an expired license within two years of the date of expiration. To renew such expired license, the person shall submit an application for renewal, pay the renewal fee, pay a delinquent renewal fee, pay a penalty fee, and submit approved continuing education hours as required by rule of the board. Upon a finding of extenuating circumstances, the board may waive the payment of the penalty fee; however, nothing in this section shall be construed as requiring such waiver. If more than two years have lapsed since the date the license expired, the license may not be renewed. The holder of such expired license must apply under the procedures for a new license pursuant to sections 340.200 to 340.330.
§ 340.262, RSMo