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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dea1c5da256be03fccfcf68847393f09a1c6d0f5852b8db9286107dfe981d39' 
  AND token = 'HtE7dbFo2sPRlsj6hJZdGHJ9+TAR96OOLORMMEyPuw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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