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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38a8e0ee60856e6074e2b6a0f902d42c7f84c0c1120a9a06c5f6b9906dd80a52' 
  AND token = '3TA0EzomiJcBn3Rs/+IZ/4edBdWaHd4eZjVTFr+FphU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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