SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af830565327aeb535dc17e68234fa1f9a3c6f9f62c399017df3eed115b24f386' 
  AND token = 'GZ6bA02CytrRziAI2cVFJlc/Gg0GH7F7Zg7EsG0ghv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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