SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '830078a63aa26087f1043231e35f939436bec0f21d1d968ce9f82cfe9bb00cdc' 
  AND token = 'dZ7ALHjmuw9/WFbr/Okol1KnJ5egGsp9eQ77CiQZ86U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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