SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd67dde5175f701fd68af626e472bf4414d1d66998bf2b09cb15dd9cf3575ba7d' 
  AND token = 'PWzpeZoVC8m/TLm1KRcO8vcCWWIwL+eGKtUu0+KkPEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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