SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e9f8d8ff32bc4b9a687e3cbb1264ab93476e860db04f9f1a0952234facd7916' 
  AND token = 'a4MS1LYNB2hfogYvNKAY3Ko+vhhd89D1jIUfhu+sP3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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