SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6443757753f9ea57db397e22e8fb9549e9a8c566c81ab090c3506f66868e86cc' 
  AND token = 'g1G4YFtJXCtnxOIZHV2e/ze6jAI315qnL/KnanT0K+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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