SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '985826285769165d2dae238ca4a04708563539fd40d8c73f6e50fbf1f09402b2' 
  AND token = 'Fa45WXgBhiEbBgofeq1JbjzPEYrJb/a48F4PbVO6xP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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