SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f03d61c634802e2fe03b892d7f00513e9719f804cb1a51272b17b5756f92bee' 
  AND token = 'gF8+AiUrEdfT6LWThPWrTxD8Z61lJIkqnKwtGBbqUWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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