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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25a3fe2089ba9f4cb5be7d5e529b34fd5853ee7acea21c1190e5783b0d717927' 
  AND token = 'TkpiX7kHsne3xBeLcabaYLjHRw15oEJVHgXy+F38i4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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