SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32c11fcad11dcc16910cb1a6605f0f79a61d8a5d9f295dc35e6bddba045db7b8' 
  AND token = 'gR+sEime5EKwJxAhK40yfzjMAV3dBQFuvCV5+T5xnlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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