SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3987b9b86fc477a7d60551d79a428c94364ea8b855faa9c58af4d193bac5faa7' 
  AND token = 'HaH66ZqxCBnzu2CoqoIhO15qPo4mM3Kv+4tHQ2USnT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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