SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '423e6d2665518824bac61847065e0e19b66ed8279b5d4eb5f0b34d9a71f91bd7' 
  AND token = 'd+qvG4pEmeU9DUMhYbSxm9jDNsBZkKCU90gJ1wMvJYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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