SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05cc0bf42fd5a1436f060a7f5abc5df05971171b22bb24c7ef8f4c37d5afc198' 
  AND token = 'Q1aZMcjBt7Gt2wZpyadllJXaW8H0L/MlSrwqhPZz1NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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