SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65f0ab7c3f09b8c8d62a62e49c7b06dee109334851db279eea009d307f84b6f7' 
  AND token = '85f6+yZCsJLUzo4djBDnIoVmaZQCDydsKCOovj+VwFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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