SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9171d4404660aa2fa31468e94e6f968bb0f8e9f9a7ac036c2977933c025e1661' 
  AND token = 'aKgzdR/foKUnpugyKYCmDhiBpSijmqNOsNWW+dqo4f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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