SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1295f9d1ec7ee728b9247203e7445d5f0c30c1666f0466ae8f95c8f553c8da' 
  AND token = 'ZCbGV/vN0IPwUVfDWEtu0Hz/1qUjb3qjAMlC/hU3yAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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