SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2430fc5716db9794f015142edecde554aed4fd204a29575f7c672d8f1d7ff28d' 
  AND token = 'cgp0xamRV/Myp/bGot3u96HRZhcuaxjsJK25BHzp2T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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