SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06f7f2687353acad34a814baca7f3745f13d04b9ffdc22579aa7bdcaef5b0e5f' 
  AND token = 'x+ieX9+cEMJxZoziyGfYRB55UGnTIzYOktuvmgAIfK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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