SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7df1e712bd8b355921cb4fcb685d345d0de6ae7e0683656cc7dba907fead5204' 
  AND token = 'UrYJnpjieKR/gjw/PnsWelLlyh4MDQ78AyNMbKv5ufU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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