SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd227db3785d396e0e9949306e9517634ffac24003529bdeb2509b88c8e42c4ca' 
  AND token = 'IVMnfOmvYxxOLrHD09dF1jhmCPUDVXP7/hwW8DXY/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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