SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b72f437eab27df5396cc0204dba5c5f41645a7d5c9c423fa574baa2c111b382' 
  AND token = 'Tv8MiPldtffqRAW72b9Q6W8UpyDXaKLu+CH7F/g/PvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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