SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce1e537bd803b0d43bea8656707f7df594b3458e288c26f1fd52d6cf8454d3b' 
  AND token = 'Mz6TOALZq+6FV5kt02Mfs6z/p+2yMUHOA7Rw70ns+BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}