SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f70df75de7639a13b7ad1964b538ffd59e8c77bf7ca07dbb89de8999d275711' 
  AND token = 'Eir0pY8jL2F1hoCYaCyz949UhVhyhKZUv+ZGOzePWVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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