SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c609ec4b49f2d77b1b63094ccf090396258e769723b63e3225de72af8801487' 
  AND token = 'l5d4y/tJYbJ5Q+qH8YI0DqXEGQxYzqhv73XxC4Y2UjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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