SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aae9afed93173a09724073a207a94473b8bac69cc7ffcd195c6094a585f0b55' 
  AND token = 'ty22V5QoGChIqGmvUgBAOxb2GoIFbhwVvRQE6Oh5pAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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