SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ded3c229b711be871bc76b8f29a627704973cdc46af35add469b49079cfeedc1' 
  AND token = 'vJM5FhkNMWSVogG6nIq/ab03HWARyQBi1sFanUfjVCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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