Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9f4c535f63aa87a7fa0dd36f1f6ee633d2d6c648ca40ef478e4f77c82093488' 
  AND token = 'qhFKEmnliYGUayIRA8AJPJ37tIpFXCoHcHO29Qb9AL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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