SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e50cb09758d1f19a82e9c0533ed1ef3981af109c9dc409c456ce65dc91a2dfb' 
  AND token = 'tzq1hmOs+mXviPpqRf/x9pTjLC4oVJ5g+ULH/uni7Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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