SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1efa76b03859d2c534cc887854fa41b0277a75f3a8cdebb5605ca634c46e2b81' 
  AND token = 'iYHDmezqItxNPhn15oyyxJX87gn/DgScuhR9ZDtuHVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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