SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30bae44224d219ef98d384e574079c4c40018e99a4b58f73fa791f468c318dd8' 
  AND token = '5csmV5KaFQkdO+zXOvn3EOe9B9SHHGjaBQ0jBYY3g8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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