Access to Information About Missing Children Act of 2010 - Amends the federal criminal code to allow, upon ex parte application to a federal judge or magistrate, the disclosure of any information held by any federal agency to federal officers or employees who are personally and directly engaged in an investigation, judicial or administrative proceeding, or federal grand jury proceeding relating to the case of a missing or exploited child. Prohibits the disclosure of information that would identify a confidential informant or seriously impair a civil or cirminal investigation.