SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '745c1ac664a728082930b3a5db52c5d7e643dc2dbba301a93df04ce830fd3de4' 
  AND token = 'Kag/KzjxZXGWvgacZWREiWVAhnQsDCbR4utaJuKTZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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