Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6dc3895292b34d80cd6e78bb65ce48b4f74a39f777a3bb08ce865129ff52e1e' 
  AND token = '4pp+Sbe6IajeQ8tw0DtfaiKc5QsY/BcndfA1Ej38Yns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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