SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33685ce5bcada67649ed3984c936c1888eb2b4b3a4084f41b478107b78234533' 
  AND token = 'GJYgrAcw2WSf1O3ZUWIXxP8L8rfl+7T+MypFClFSg/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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