SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '636f8670220cd85636fb2fe80120e49c4d5a822559bae651875d1995ec62b59a' 
  AND token = 'YeA+wuaLkySXJvJ3I+Z6dygvNMewsL4qgeUO1QMU0KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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