SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e7a76de1e2caf77c782abf89432fc623eb7e2066386994ba0589a3edf438b31' 
  AND token = '2lGkAS6gOVJpCL4R+jyNicGBFMTMAZiGWVdYFFjIkHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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