Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec6b8d98436e63047492a617eaa645fd96bccb868177ab75bd90073b49f94b73' 
  AND token = '1/5O9MrfbRW45RMxU1m+PBbKQX7HoRfZqUn2r36/dQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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