SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '035c298b784693eecc0600f72301ed63ebfa6a2a8e2310d27b7db0a8bdd98676' 
  AND token = 'pYKDFqRrKJiDRwUut9xYB/WqKz4Rvlr/URCyRvPekWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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