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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9653a8ab64cf5888fe340dc7ad1e46230724b6fddebbf8d915c56a4dddedd6f' 
  AND token = '/rQ2oPLiZufg45gPL176pzeTrjv4qTVgpE+hwDAe0jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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