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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e0e1d68b7433ce3ec74d69e2853153f8985edd21e4c1ed3f0cf8ff7b1ae961f' 
  AND token = 'QjI4MaYx46Yca8Qs9Ho4q/Kpy8pJeHVpX9iAfQyQT28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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