SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5856430aed91bcc65e97b5a02d8a28ab2f8f955ec18c31a3f2bd3c4a65ffbe6' 
  AND token = 'zSHnq1GWHVwsNn/vn2Gby9qt9RCfJxcOUQGY00jUH/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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