gistfile1.php

function is_my_protected_meta( $protected, $meta_key, $meta_type = null ) {
  $protected = ( $protected && ( strpos( $meta_key, "_aioseop" ) !== 0 ) );

  return $protected;
}
add_filter( 'is_protected_meta', 'is_my_protected_meta', 10, 3 );