SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22ed2baca571695dc84346b6d340b58f6a7ea0bd7a0cc472916f6b9e0494f161' 
  AND token = '0mtGJZthXhfHtxanii/pwPjtRrvAUNQCFCdGqux/4UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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