SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68eb085351104bdc449adb71153d70b9a0be6d60913e218ee5f93a9c491ff0d9' 
  AND token = 'NOzWn+s6POZLpPOejBI/hX5gYaKbNGZPcT8oUT4U3ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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