SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3056cbc0a757c4d02d14081fa5e0871bb1c40193acfb2c2e372cd6cb232cd136' 
  AND token = 'BuIYV2q4SfUwAYF5B6VvL+PheGt9Wr3yJPKISzf32t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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