SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '075a5dfd97a67db03b977c602c857d3fd22a97fab1bc96d5040e5a2d2b249082' 
  AND token = 'hggwSSRZ2Z70VLwL/ZIaxIKBs0pmhYimIk+zyaPTbvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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