SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2de98f156b6fe98cae6e122edd4331f48ad9c59b3ee38ba8402bb085a2a3d63d' 
  AND token = 'IOCRVyTzS0agV+rxnGZVDc8mDxkGKYZFHL//RKB6KO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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