SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dbccf15380e75b19235ad7f6002d87663b0d7ca2b42a84a3f6ff506c6e7d83d' 
  AND token = 'GvAZR7dCKDH0f4/nIu/bNQJao+fZc8sjar5dwmgS8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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