SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05f4ed78901d75296181108b9f8e308efe7467767799e1335fe3a9a2e9cbd8ba' 
  AND token = 'oygcKp4GzUKOh9HK0eDwdm/zhq9Oo2QZ0Q9d+LNd4+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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