SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da03db110f92512df65acb9d47a00a491968072111067ce94da7c47c6576682' 
  AND token = '3JgwyFaCJx+G7xO8GjX17uY7hSTsGR9UbsROgzb4HpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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