SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7058396e8a80462d7f2a8bd652355c7a3cf8fc63d69164eb45613e1ed22a51bd' 
  AND token = '20DwxTgH8qSTBaiwQaKvwKKYOOjuJguet3BvdAQFrQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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