Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c438f23200146d8f11fb15443e5dae48a627556989be1731f054131652c49625' 
  AND token = 'iV2nrViaTQ8n94ZEVGj30izc1ej83meGXndtyHZ783Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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