SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b53995046f69dfb9057bd8599df986c0127d1c2aef255dda40508d441d6f184' 
  AND token = 'avB3DhgP7NlsmQyn9NM+ARrZRCc7CNNH36uVmZfK2vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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