SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce208f4039204b9b321aecaf09bf388972cc29a34318c4073eb3a8ddf45e1676' 
  AND token = 'LEoRtIX5z1aGt8RYx6wbWMtS/0GjIYKJDWC+qSageXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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