SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96162c8a17fd2ba44db171dc3b8f243b44c7940f8c77e75b1654ad44ee69e034' 
  AND token = 'TgSkNnW9K/vsD9gSth23FnUXtQwnx75Hfe7jACFiVqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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