SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b017f2813869646d8f0de4775185aa65e73d2810e662186832fbd00164cef8f' 
  AND token = 'bFWDD45Kiw9uWx8cZoRhovBdeTaxXq+NFb/+T7r/v9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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