SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f6b641ce691f3525d2af344091cbe672edd6fa20d1c4968e2b637e423323d7d' 
  AND token = 'qIKyejFgpnDaLmqG1ME0ggEFOLHRzFvwW4QrrlLPJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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