SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2284d9dbde35b02dd52aa70c780e0be44b2cb1164423c3ff652d56f62f220a4f' 
  AND token = 'lLChKYJvds2mgsWDYoQaEvwZmbdAiFjYQkAPc5qUK1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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