SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eda66c33d2c935c53c042aab0c272f66ddfff4f337774ce018b0b8e174f27d2' 
  AND token = 'e0H9Bf7DLe2Vq2qGgMlz/7iUG59U80Kmsnhyc/lPkXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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