SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47a7fef9c73a6ef60b0d55241ddb5b80c3748bf57ea79474c4051e57941e7432' 
  AND token = '+CbfQJVP+Y6mLirNznPwOsqSycERaKzGjCQCC/lUP4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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