SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e49a4c86ce88b29dd7b37b651f0a21cfb0fc2540166439f51fb22f39d776b30d' 
  AND token = '9isfMbu5eBZhwx8YCTDSCrBciSvDpwKPKEghSSk0JHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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