SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd79d1b92a44289452b29c235c0f2bff4c74a146ea6ae8e1e4751a123bb2ee87f' 
  AND token = '7u1VmZKJg/sMaUJHqcX8PyYvws6ZiLifSZL4EwXZQm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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